Floor structure



I. W. MASON.

FLOOR STRUCTURE.

APPLICATION FILED APR.5. 1919 Patented J une 22, 1920.

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PATENT OFFICE.

IRVING w. MASON, or ABERDEEN, WASHINGTON.

FLOOR STRUCTURE.

Specification of Letters Patent. Patented June 22, 1920.

Application filed April 5, 1919. Serial No. 287,673.

To all whom it may concern:

Be it known that I, IRVING. W. MASON, a citizen of the United States, residing at Aberdeen, in the county of Grays Harbor and State of Washington, have invented a new and useful Floor Structure, of which the following is a specification.

This invention relates to floor structures and has for its object the provision of a floor comprising a plurality of layers of material of relatively different values, another object is novel means of fastening the superimposed layer to the floor without the use of nails or other similar fastening devices. With these and other objects in View as will appear as the description proceeds, theinvention resides in the novel. arrangement and combination of parts, more particularly pointed out in the appended claims.

In the drawing is illustrated, in transverse sectioii, a floor structure embodying the features of my invention. In the building of hardwood floors it has heretofore been the practice to use a relatively thick layer of hardwood and nail the same to the under structure. In the floor structure the subject of my invention, provision is made whereby a comparatively thin layer of the more expensive hardwood may be used in connection with a base of cheaper material.

Referring specifically to the drawing the I numeral 1 indicates the usual floor joists, at

2 is shown a layer of material of ordinary flooring or other relatively cheap wood, each piece of which is provided on its surface with a dovetail rib 3 and on its opposite edges with a tongue and groove 4, and is laid in the usual way, being secured to the joist by nails as indicated at 5. The hardwood floor is laid over the cheaper floor and each plank 6 is provided on its opposite edges with a groove 7, which is engaged by the rib 3 to secure the plank to the sub floor 2.

In laying the floor, planks of the lower and upper members are laid alternately; that is, a plank of the under structure is first nailed to the joists, then a piece of the upper or hardwood flooring is fitted to the rib 3, then a plank of the lower member is placed with its groove 4 in engagement with the tongue of the piece already laid and its rib 3 engaging the groom 7 of the upper member, is then drawn tightly to the members already laid and nailed fast.

A floor structure of this kind will be much 1 less expensive to lay and will have better joints, without the necessity of nailing through the hardwood of floors as heretofore constructed.

I claim- In a structure of the class described, a sub-structure; floor boards onthe sub-structure and provided on their upper surfaces with integral undercut ribs; upper members supported by the floor boards and provided at-their meeting edges with dovetailed recesses receiving the ribs; and inclined securing devices passing through the floor boards independently of the ribs, the boards being appreciably thicker than the ribs to 7 permit the securing devices to be of a maximum size.

In testimony that I claim the foregoing as my own, I have hereto afiixed my signature in the presence of two witnesses.

IRVING W. MASON. Witnesses:

E. E. BoNER, A. P. STREETMUL. 

